Prop up
Prop up verb - To hold up or serve as a foundation for.
Underlay
Underlay verb - Put (something) under or beneath.
Cite this Source
Underlay and Prop up. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/prop_up/underlay
Prop up & Underlay. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/prop_up/underlay>.
Underlay or Prop up. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/prop_up/underlay.
Google Ngram Viewer shows how "prop up" and "underlay" have occurred on timeline